10(Version 0.3.1) This really is a great editor for pixelling animations, very easy to use (once you know the keys). The previous frame is transparently shown behind the current one, and you can switch around frames simple by using the cursor keys. Also the drawing is made very easy - you can select colors from the palette on the left or from the image, and you can change the brush size on the fly with the + and - key. And of course, there's loads of additional features (even scripting).

100.2.4: This is an excellent sprite editor packed with useful tools and other features. The GUI looks simple but is very quick and efficient and even though this program is still a work in progress and tends to crash occasionally, it is already a great tool that really should be on every Allegro developer's hard drive...